Japan Flora: Rhizomes with short in ternodes; leaves usually in pairs,long-petioled, cordate or reni- form-cordate, 5-10 cm. wide, usually abruptly acute, scattered short-pilose on both sides especially while young; flowers solitary, on short pedicels, glabrous, the perianth-tube depressed- globose, the lobes broadly deltoid-ovate, often recurved on margin; styles 6; stamens 12. Mar.-Apr.